Two radioactive X(1) and X(2) have decay...

Two radioactive `X_(1)` and `X_(2)` have decay constants `10 lambda ` and `lambda` respectively . If initially they have the same number of nuclei, then the ratio of the number of nuclei of `X_(1)` to that of `X_(2)`will be `1//e` after a time .

`1//10lambda`

`1//11lambda`

`11//10lambda`

`1//9lambda`

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